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Changes In Soil Salinity Levels With The Use Of Recycled Water On Cool Season Vegetables, Dana Cameron Ripley

Master's Theses

Agricultural production in Monterey County, California is a multi-billion dollar industry. Near the coast, seawater intrusion has threatened to degrade the groundwater quality due to over-pumping of the aquifer. The Monterey Regional Water Pollution Control Agency (MRWPCA), in partnership with the Monterey County Water Resources Agency, has provided recycled water since 1998 to over 12,000 acres of prime agricultural farmland in the northern Salinas Valley in an effort to reduce groundwater removal. The dominant soil types in the region are clay loam and clay soils, which are both susceptible to sodium (Na) accumulation and water infiltration problems. Recycled water blended …

Lipid Production By Microalgae Treating Municipal Wastewater, James Edward Kelley

Master's Theses

Microalgae hold much promise as a feedstock in liquid biofuel production. Lipid content of microalgae cells range from 30-80% dry weight of biomass. It is projected that microalgae can produce between 1,000-6,500 gallons/acre/year of oil. Currently, production of industrial algae operates in open raceway ponds that use minimal capital and energy inputs to culture algae. Raceway ponds can also be used to grow microalgae from municipal waste streams. Although high biomass productivity can be achieved in these systems, there remains a large production gap between large volumes of biomass cultivation and high lipid content from microalgae cells. Low lipid content …

Protective Effects Of Sphingomyelin Against Uv Photodamage In Human Keratinocytes, Kathleen De Guzman

Master's Theses

Ultraviolet (UV) radiation has been demonstrated in numerous studies to be a major risk factor for non-melanoma skin cancer development. Despite the emergence of current UV-preventative strategies, such as sunscreens and skin-protective clothing, the incidence of non-melanoma skin cancer has continued to rise. This has encouraged investigations on alternative methods for UV prevention. In particular, bovine milk sphingomyelin has been studied for its potential in protecting human skin against UV photodamage. While the previous studies have suggested that sphingomyelin exhibits UV-protective properties in a human skin equivalent model, the exact mechanisms behind sphingomyelin’s photoprotective effects are yet unknown.

This thesis …

Development And Validation Of A Human Hip Joint Finite Element Model For Tissue Stress And Strain Predictions During Gait, Jeffrey D. Pyle

Master's Theses

Articular cartilage degeneration, called osteoarthritis, in the hip joint is a serious condition that affects millions of individuals yearly, with limited clinical solutions available to prevent or slow progression of damage. Additionally, the effects of high-risk factors (e.g. obesity, soft and hard tissue injuries, abnormal joint alignment, amputations) on the progression of osteoarthritis are not fully understood. Therefore, the objective of this thesis is to generate a finite element model for predicting osteochondral tissue stress and strain in the human hip joint during gait, with a future goal of using this model in clinically relevant studies aimed at prevention, treatment, …

An Assessment Of Habitat Suitability For Pronghorn Populations Of The Central Valley Region Of California, Virginia Burroughs

Master's Theses

Efforts to reintroduce and maintain populations of pronghorn (Antilocapra americana) to the California Central Valley, specifically the Carrizo Plain National Monument (CPNM) and the Mojave Desert (Antelope Valley) portion of Tejon Ranch, have largely been unsuccessful due to dwindling numbers of translocated animals. The objective of this study was to improve upon previous models for the CPNM using aerial survey data and then apply the model to the Tejon Ranch. Aerial survey data collected from 2000-2010 on the CPNM was used to establish “use” and “non-use” areas in the model. Model variables included vegetation type (forest, shrub, grassland, …

Mechanical Properties Of Bone Due To Sost Expression: Nanoindentation Assessment Of Murine Femurs, Amir Rafie

Master's Theses

In the human genome, the SOST gene codes for a protein sclerostin. Sclerostin is an osteocyte-expressed negative regulator of bone formation. When the SOST gene is not coded, bone formation is reduced in individuals during skeletal maturation. This study utilizes nanoindentation methods to test for the mechanical properties of bones that both express and do not express the SOST gene. 100 transgenic murine femurs were obtained from Lawrence Livermore Labs in the form of 6 and 8 month SOST transgenic mice, 6 and 12 month SOST knockout mice, and wild type control littermates for each of the 4 age groups. …

The Influence Of Hydrogeomorphology, Soil Redox Conditions, And Salinity On The Spatial Zoning Of Saltgrass, Salt Rush, And Cattails In Scotts Creek Marsh, Swanton Pacific Ranch, Ca, Mark D. Gormley

Master's Theses

Scotts Creek Marsh (SCM) is a small coastal wetland ecosystem in Davenport, CA. The vegetation of SCM is dominated by three halophytic zones comprised of saltgrass, salt rush, cattails. The objectives of the study were (i) to investigate the variables that influence the zoning of the three dominant halophyte communities in SCM and (ii) to the test the effectiveness of Indicator of Reduction in Soil (IRIS) tubes to indicate the reduction of S. The study examined the following parameters from April 6 to July 21, 2013: (i) the HGM of Scotts Creek Marsh, (ii) soil oxidation and reduction (redox) conditions, …

Conjugated Linoleic Acids Alter Body Composition Differently According To Physiological Age In Moulard Ducks, Jeff Fesler, Daniel Peterson

Master's Theses

Conjugated linoleic acids (CLA) have been shown to have remarkable yet inconsistent metabolic effects in mice, rats, hamsters, chickens, cattle, and humans. In particular, effects on lipogenesis vary with tissue, physiological state and specie. In this study we tested the hypothesis that CLA would differentially affect ducks of the same genetic background but of differing age. Growing (7 wk) and maintenance (11 wk) Moulard ducks were grouped by age and fed a standard diet supplemented with either 5% soybean oil (control) or 5% CLA isomer mixture. Animals were harvested after 3 weeks or 6 weeks for assessment of body composition …

Initiating And Sustaining Conversations Between Organic Farmers And Extension, Jason Parker, Patrick Lillard

Journal of Extension

The relationship between advocates of organic agriculture and land-grant university agents has evolved significantly over the past century, but land-grant research and Extension agents still confront many challenges to working with organic farmers. This article reviews the barriers to communication that have developed over the last century and initiates a discussion on how to facilitate successful collaborations among Extension agents, researchers, and organic farmers.

Adoption Of Integrated Pest Management Practices Among Oklahoma Greenhouse Producers: A Case Study For Experiential Learning, Eric J. Rebek, Michael A. Schnelle, Kay D. Kelsey

Journal of Extension

An instruction- and experience-based workshop was conducted for Oklahoma greenhouse producers to teach principles of integrated pest management (IPM) for common arthropod pests of greenhouse crops. Workshop effectiveness was evaluated using a pre- and post-test instrument to measure changes in knowledge and attitudes about IPM and current use and intention to adopt IPM practices. Findings indicate the objectives were accomplished as participants reported significant increases in IPM knowledge, a marked acceptance of IPM practices, and a willingness to adopt IPM. Extension workshops that combine classroom instruction and hands-on demonstration can be used effectively to teach relevant concepts to stakeholders.

Measuring The Impact Of Termite Prevention Curricula In Hawaii Public Schools In An Area-Wide Extension Program, Makena Mason, Maria Aihara-Sasaki, J Kenneth Grace

Journal of Extension

The efficacy of Educate to Eradicate, a K-12 service-learning science curricula developed as part of a statewide, community-based Extension effort for termite prevention, was evaluated. The curricula use termite biology and control as the basis for science education and have been implemented in over 350 Hawaii public school classrooms with more than 12,530 students from 2001 to present. Student surveys and work samples were used to measure changes in student knowledge, behavior, and engagement. Use of school curricula in Extension programs reaches a large public audience and encourages long-term continuation of community pest prevention efforts.

Fuzzy Search Strategy Generation For Adversarial Systems Using Fuzzy Process Particle Swarm Optimization, Fuzzy Patterns, And A Hunch Factor, Stephany Coffman-Wolph

Dissertations

Adversarial game-playing situations have been studied in both game theory and artificial intelligence since the 1950s. However, developing strategies for game playing is challenging due to the large search tree size as the environment size increases. The research presented develops a centralized fuzzy search strategy to find winning strategies for adversarial situations using fuzzy logic. The aforementioned fuzzy algorithm, Fuzzy Strategy Finder (FSF), can be used to find valid strategies for any problem that can be written as a Reti-like or zero-sum game. Using several chess endgames, the FSF will be shown to have a faster runtime without a significant …

Determining Parentage And The Effects Of Relatedness On Play Partner Preference In Belding's Ground Squirrels, Jessica Weidenbach

Master's Theses

I investigated 1) multiple paternity in Belding’s ground squirrels (Urocitellus beldingi) and 2) social partner preferences in juvenile U. beldingi. Prior work with blood allozymes demonstrated multiple paternity in U. beldingi litters. I evaluated paternity using microsatellite DNA analysis, which is more accurate than examining blood allozymes. My results indicate that multiple paternity in U. beldingi is more extensive than previously shown, occurring in about 90% of litters with more than one juvenile, and averaging 2.95 fathers in multiply sired litters. I also evaluated the hypothesis that play and other social behavior promotes bonding among juvenile female …

Building Women’S Solidarity To Advance Women’S Rights In Bolivia, Luzdary Hammad

Master's Theses

This paper takes a historical look at the deep-seated ethnic and class divisions between women in Bolivia. It also examines the cultural challenges that help explain the status of women in Bolivia and the obstacles women face to become politically active. It provides the theories of decolonization and depatriachalization as practical ways Bolivia can move past their colonial and patriarchal history. It also looks into what feminism means overall in Latin America and what strategies Latin American women have used to make change for women. It then provides a political history of Bolivia from 1994 to the present giving the …

Constraints On Patterns Of Abundance And Aggregation In Biological Systems, Kenneth J. Locey

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Understanding the mechanisms that structure biological systems is a primary goal of biology. My research shows that the biological structure is constrained in important ways by general variables such as the number of base pairs in a genome and the number of individuals and species in a community. I used a combination of macroecology, bioinformatics, statistics, mathematics, and advanced computing to pursue my research and published several peer-reviewed scientific manuscripts and open-source software as a result.

I was funded through a combination of fellowships and scholarships awarded by the Utah State University School of Graduate Studies, College of Science, and …

An Algorithm To Recognize Multi-Stable Behavior From An Ensemble Of Stochastic Simulation Runs, Eduardo Monzon

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Synthetic biological designers are demanding tools to help with the design and verification process of new biological models. Some of the most common tools available aggregate multiple simulation results into one “clean” trajectory that hopefully is representative of the system’s behavior. However, for systems exhibiting multiple stable states, these techniques fail to show all the possible trajectories of the system. This work introduces a method capable of detecting the presence of more than one “typical” trajectory in a system, which can also be integrated with other available simulation tools.

Winter Waterbird Ecology On The Great Salt Lake, Utah, And Interactions With Commercial Harvest Of Brine Shrimp Cysts, Anthony J. Roberts

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Interactions among commercial fisheries and birds have been studied in open ocean ecosystems and at aquaculture facilities. On the Great Salt Lake (GSL), Utah, USA, a commercial harvest of brine shrimp (Artemia franciscana) eggs (i.e. cysts) occurs annually during fall and winter. Coinciding with commercial harvest is the use of the GSL by millions of waterbirds which has the potential to result in conflict among industry and birds. The objectives of my research were to examine fall and winter ecology of birds using the GSL and interactions with the brine shrimp cyst harvest. I examined the influence of temperature and …

Substrate Binding And Reduction Mechanism Of Molybdenum Nitrogenase, Zhiyong Yang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

As a key constituent of proteins, nucleic acids, and other biomolecules, nitrogen is essential to all living organisms including human beings. Dinitrogen represents the largest pool of nitrogen, about 79% of the Earth’s atmosphere, yet it is unusable by most living organisms due to its inertness. There are two ways to fix this inert dinitrogen to usable ammonia. One is the industrial Haber-Bosch process, which needs to be conducted at high temperature and pressure. This process uses a lot of the non-renewable fossil fuel as the energy source. The other major pathway is the biological nitrogen fixation carried out by …

Conventional And Catalytic Pyrolysis Of Pinyon Juniper Biomass, Bhuvanesh Kumar Yathavan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Pinyon and juniper are invasive woody species which has occupied more than 47 million acres of land in Western United States. Pinyon juniper woodlands domination decreases the herbaceous vegetation, increase bare lands which in turn increases soil erosion and nutrition loss. Thus, The US Bureau of Land Management (BLM) has focused on harvesting these woody species to make room for herbaceous vegetation. The major application of harvested pinyon-juniper (PJ) is low value firewood. Thus, there is a need to develop new high value products from this woody biomass to reduce the cost of harvesting. In this study pyrolysis was carried …

Effect Of Predator Removal On Greater Sage-Grouse (Centrocercus Urophasianus) Ecology In The Bighorn Basin Conservation Area Of Wyoming, Elizabeth Kari Orning

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The decline of greater sage-grouse distribution and population densities across western North America has led conservation, research, and management objectives to focus efforts on understanding sage-grouse populations across their range. The purpose of this study was to gain a better understanding of direct and indirect predation effects on hen survival and nest success of sage-grouse. The project was conducted in Hot Springs and Park Counties in the Bighorn Basin of Wyoming. The study had three main objectives: 1) obtain and quantify the types and impacts of predators on sage-grouse hen survival and nest success, 2) compare the effect predator removals …

The Status Of Plethodon Ainsworthi Lazell: Extinct, Extant, Or Nonexistent?, John G. Himes, David C. Beckett

Faculty Publications

Plethodon ainsworthi Lazell was described as a new species in the slimy salamander (Plethodon glutinosus [Northern Slimy Salamander]) complex from two specimens collected in Jasper County, MS, in 1964. Prior to their designation as the type and paratype of the newly described species in 1998, both specimens were presumably stored in strong formalin for 26 years and thus were in poor condition. Plethodon ainsworthi is distinguished from the sympatric Plethodon mississippi (Mississippi Slimy Salamander) by a more attenuated body, as evidenced by a higher snout-vent length (SVL)/head width (HW) ratio, and shorter limbs. Despite numerous searches between 1991 and …

Cross Amplification Of Microsatellite Loci Developed For Atractosteus Spatula In Atractosteus Tropicus, Sandra Bohn, Enrique Barraza, Caleb Mcmahan, Brian Kreiser

Faculty Publications

Due to recent population declines in tropical gar (Atractosteus tropicus), a greater understanding of its population structure is needed. A key step in gaining this understanding is the development of microsatellite loci for use in this species. For this purpose, 33 microsatellite loci from alligator gar (A. spatula) were screened in 52 individuals from a population in Zanjón del Chino, El Salvador. Twenty-five of these loci successfully amplified in this species, and 9 of those loci were polymorphic in this population. These loci should provide a useful tool for genotyping A. tropicus, both in studying …

A Test Of Whether Human Handling Causes Developmental Or Habituation Effects On The Hypothalamic-Pituitary-Adrenal Stress Response Of Young American Kestrels (Falco Sparverius), Erin Leigh Wonder

Boise State University Theses and Dissertations

Early exposure to stressors affects subsequent stress responses in both mammalian and avian species, with the likelihood for lasting effects depending, in part, on the magnitude of the stressor. However, it is unclear whether lasting effects are the result of developmental changes to the hypothalamic-pituitary-adrenal (HPA) axis or habituation to the stressor. I investigated the effects of human handling, a known stressor, in free-living American kestrel (Falco sparverius) nestlings to determine if this brief, non-invasive stressor causes lasting changes in the stress response of handled birds, and whether alterations in the stress response were the result of developmental …

Interaction Of Fast Highly Charged Ions With Insulating Straight And Tapered Glass Capillary Surfaces, Asmaa Mohammed Ayyad

Dissertations

Transmission of fast highly charged ions through insulating single straight cylindrically-shaped and tapered funnel-shaped glass capillaries of microscopic dimensions has been studied using MeV/u proton and oxygen beams. The beams, obtained from the WMU tandem Van de Graaff accelerator, were transmitted through the capillaries and then counted with a silicon surface barrier detector.

The interaction between 1 and 3 MeV protons and 12, 16 and 24 MeV O⁵⁺ ions and the inner walls of the straight and tapered glass capillaries was investigated by measuring the transmission energy dependence. The straight capillaries had diameters of 0.18 and 0.14 mm and …

Quantifying Value In Public Health: Using Economic Methods To Analyze System Change, Theresa M. Green

Dissertations

In this time of economic downturn, it is becoming increasingly important for organizations, including those in public health, to “prove their worth,” to show the value in improvement strategies. Health agencies have learned to discuss impact in terms of health outcome and mortality/morbidity measures. However, it is critical that these impacts are also expressed in a way that shows cost-efficiency and economic benefit especially for promising, evidence-based public health interventions. Although several methods of economic evaluation including cost-effective analysis, cost-utility analysis, or cost-benefit analysis and return on investment (ROI) have been used in social sciences and health research, fewer examples …

Mixed Methods Analysis Of Counselor Views, Attitudes And Perceived Competencies Regarding The Treatment Of Internet Pornography Addiction, Bradly K. Hinman

Dissertations

The Internet offers unprecedented opportunity for individuals to have anonymous, inexpensive, and unrestricted access to an essentially unlimited range of sexually explicit materials. Counseling clients are increasingly presenting with problematic issues regarding Internet pornography use. The purposes of this mixed-method study were (a) to examine the current status of counselors’ attitudes and self-efficacy about treating clients with Internet pornography addiction, and (b) to ascertain the opinions of counselor educators who are experts in the field of Internet pornography addiction on the current status of counselor training and best practices for preparing counselors.

The quantitative data was obtained from a 90-item …

Old English Ecologies: Environmental Readings Of Anglo-Saxon Texts And Culture, Ilse Schweitzer Vandonkelaar

Dissertations

Conventionally, scholars have viewed representations of the natural world in Anglo-Saxon (Old English) literature as peripheral, static, or largely symbolic: a “backdrop” before which the events of human and divine history unfold. In “Old English Ecologies,” I apply the relatively new critical perspectives of ecocriticism and placebased study to the Anglo-Saxon canon to reveal the depth and changeability in these literary landscapes. Overall, this interdisciplinary study of Anglo-Saxon texts brings together literary and environmental sources and modes of inquiry to explore the place of humans (and non-humans) within the natural environments of Anglo-Saxon England, as well as the ways in …

Developing Ethical Competence: The Perspective Of Nurse Educators From Pre-Licensure Baccalaureate Nursing Programs Accredited By The Commission On Collegiate Nursing Education, Jennifer Lee Bartlett

UNLV Theses, Dissertations, Professional Papers, and Capstones

Nurses face ethically-charged situations every day, yet ethics education is not universally integrated into pre-licensure baccalaureate nursing programs. Like other forms of competence, ethical competence requires development. Nurse educators are poised to impact on the competence of their students, both defining the ethics content and designing students' exposure. The purpose of this study is to describe the concept of ethical competence from the perspective of baccalaureate nursing faculty and describe current methods of integration and evaluation of ethics education in pre-licensure baccalaureate nursing programs. This research will be conducted using a sequential (quantitative-qualitative) mixed method approach. The first phase of …

Second Language Gesture And Acculturation In Study Abroad Contexts, Christie Marie Gardner

UNLV Theses, Dissertations, Professional Papers, and Capstones

Motivationis an integral part of learning; Gestures are an important aspect of human communication, and culture plays a significant role in shaping all of these human elements. This study explores the relationship betweensocial, cultural-historical activityand second language(L2) gesture acquisitionas student motivations both drive, and emanate from, the L2 learning process. Six American students participating in a study-abroad program in Chile were evaluated at three different levels of L2 proficiency (beginning, intermediate, and advanced) for L2 gesture articulations and motivational developments. During the semester-long investigation, three audio-video recorded interviews were conducted to observe L2 gestural behaviors, and two e-mail logs were …

What Works In Suicide Bereavement: What Helps And What Hurts?, Quintin Hunt

UNLV Theses, Dissertations, Professional Papers, and Capstones

Suicide is one of the most painful grief experiences that any family may experience. The suicide bereavement literature, though small, is replete with research that shows family and systemic impacts of suicide. The literature also includes constant calls for family- and systemic-based intervention as every part of society is impacted. Research in the field of marriage and family therapy, however, has ignored suicide and suicide bereavement almost entirely. The purpose of this qualitative study is to develop a more thorough understand of the grief that survivors of suicide experience and to systemically understand what helps and hurts the grieving process. …